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TonyDuell · 6th Aug 2020, 11:59 am

Philips made a series of speakers that they called 'Motion FeedBack' (or MFB). These had a piezo-electric transducer on the bass driver unit that sent a feedback signal to the (built-in) amplifier. IMHO the smaller ones are more impressive (it's not too hard to get reasonable bass response from a large speaker cabinet).

Service manuals for them are on the web somewhere if you want to see what they did. The units themselves are not too rare and don't command 'audiophool prices'. I paid a few 10's of pounds for a pair of the smallest units that I must try out sometime...

6th Aug 2020, 11:59 am	#1688
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,222	Re: The Audiophoolery Thread. Philips made a series of speakers that they called 'Motion FeedBack' (or MFB). These had a piezo-electric transducer on the bass driver unit that sent a feedback signal to the (built-in) amplifier. IMHO the smaller ones are more impressive (it's not too hard to get reasonable bass response from a large speaker cabinet). Service manuals for them are on the web somewhere if you want to see what they did. The units themselves are not too rare and don't command 'audiophool prices'. I paid a few 10's of pounds for a pair of the smallest units that I must try out sometime...